| ZHANG Peng,ZURAIDA Rina,XU Jian,YANG Ce. 2016. Stable carbon and oxygen isotopes of four planktonic foraminiferal species from core-top sediments of the Indonesian throughflow region and their significance. Acta Oceanologica Sinica, 35(10):63－75 |
| Stable carbon and oxygen isotopes of four planktonic foraminiferal species from core-top sediments of the Indonesian throughflow region and their significance |
| 印尼穿越流区现代浮游有孔虫四个属种壳体的稳定碳、氧同位素及其意义 |
| Received:August 30, 2015 Revised:April 22, 2016 |
| DOI：10.1007/s13131-016-0890-1 |
| Key words:planktonic foraminiferal δ18O and δ13C calcification depth freshwater input Java-Sumatra upwelling Indonesian throughflow region |
| 中文关键词: 浮游有孔虫δ18O和δ13C 钙化深度 淡水输入 爪哇-苏门答腊上升流 印尼穿越流区 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZHANG Peng | State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University, Xi'an 710069, China | | | ZURAIDA Rina | Marine Geology Institute, Bandung 40174, Indonesia | | | XU Jian | State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University, Xi'an 710069, China | jx08@live.cn | | YANG Ce | State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University, Xi'an 710069, China | |
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| Abstract: |
| Horizontal and vertical distributions of δ18O and δ13C were investigated in shells of four planktonic foraminiferal species, Globigerinoides ruber, Globigerinoides sacculifer, Pulleniatina obliquiloculata and Neogloboquedrina dutertrei, from a total of 62 core-top sediment samples from the Indonesian throughflow region. Results were compared to modern hydrologic conditions in order to explore potential of proxies in reconstructing fluvial discharge and upper ocean water column characteristics in this region. Our results show that, in the Makassar Strait, both of depleted δ18O and δ13C of these four species were linked to freshwater input. In the Bali Sea, however, depleted δ18O and δ13C for these species may be due to different reasons. Depleted δ18O was a result of freshwater input and as well influenced by along-shore currents while depleted δ13C was more likely due to the Java-Sumatra upwelling. Comparison of shell δ18O records and hydrographic data of World Ocean Atlas 2005 suggests that G. ruber and G. sacculifer calcify within the mixed-layer, respectively at 0-50 m and 20-75 m water depth, and P. obliquiloculata and N. dutertrei within the upper thermocline, both at 75-125 m water depth. N. dutertrei calcifies at slightly deeper water depth than P. obliquiloculata does. In general, δ13C values of both G. ruber and G. sacculifer are larger than those of P. obliquiloculata and N. dutertrei at all sites, possibly related to depth habitats of these species and vertical distribution of nutrients in the Indonesian throughflow region. |
| 中文摘要: |
| 本文分析了印尼穿越流区62个钻孔顶部沉积物样品中浮游有孔虫Globigerinoides ruber，Globigerinoides sacculifer，Pulleniatina obliquiloculata和Neogloboquedrina dutertrei壳体的δ18O和δ13C的水平以及垂直分布，并将结果与研究区内的现代水文条件进行对比，旨在探索研究区内河流淡水输入对海洋上部水体结构和性质的影响。结果显示，这四个浮游有孔虫壳体的δ18O和δ13C在望家锡海峡内均相对贫化，可能与淡水输入有着密切的关系。然而，尽管这些浮游有孔虫壳体的δ18O和δ13C在巴厘海也都相对贫化，但很可能是由不同的原因造成。在巴厘海，贫化的δ18O可能是受淡水输入的影响，而贫化的δ13C可能是由爪哇-苏门答腊上升流造成的。将这些浮游有孔虫壳体的δ18O与水文数据进行对比，本文发现G. ruber和G. sacculifer在混合层钙化壳体，水深分别为0-50m和20-75m；P. obliquiloculata和N. dutertrei则在温跃层上部钙化壳体，尽管水深均介于75m和125m之间，但N. dutertrei的钙化深度平均比P. obliquiloculata的更深一些。总得来说G. ruber和G. sacculifer的δ13C大于P. obliquiloculata和N. dutertrei，可能是由其不同的钙化深度以及印尼穿越流区域营养盐的垂直分布造成的。 |
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